MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Determine Ad and Ac for the given circuit. |
| A. | Ac = 0 and Ad = 1 |
| B. | Ac ≠ 0 and Ad = 1 |
| C. | Ac = 0 and Ad ≠ 1 |
| D. | Ac ≠ 0 and Ad ≠ 1 |
| Answer» B. Ac ≠ 0 and Ad = 1 | |
| 2. |
For the difference amplifier shown below, let all the resistors be 10kΩ ± x%. The expression for the worst-case common-mode gain is |
| A. | x / 50 |
| B. | x / 100 |
| C. | 2x / (100 – x) |
| D. | 2x / (100 + x) |
| Answer» E. | |
| 3. |
For the circuit shown below express v0 as a function of v1 and v2. |
| A. | v0 = v1 + v2 |
| B. | v0 = v2 – v1 |
| C. | v0 = v1 – v2 |
| D. | v0 = -v1 – v2 |
| Answer» C. v0 = v1 – v2 | |
| 4. |
For the circuit given below determine the input common mode resistance. |
| A. | (R1 + R3) || (R2) || + (R4) |
| B. | (R1 + R4) || (R2 + R3) |
| C. | (R1 + R2) || (R3 + R4) |
| D. | (R1 + R3) || (R2 + R4) |
| Answer» D. (R1 + R3) || (R2 + R4) | |
| 5. |
For the difference amplifier as shown in the figure show that if each resistor has a tolerance of ±100 ε % (i.e., for, say, a 5% resistor, ε = 0.05) then the worst-case CMRR is given approximately by (given K = R2/R1 = R4/R3) |
| A. | 20 log [K+1/4ε]. |
| B. | 20 log [K+1/2ε]. |
| C. | 20 log [K+1/ε]. |
| D. | 20 log [2K+2/ε]. |
| Answer» B. 20 log [K+1/2ε]. | |
| 6. |
If for an amplifier v1 and v2 are the input signals, vc and vd represent the common mode and differential signals respectively, then the expression for CMRR (Common Mode Rejection Ratio) is |
| A. | 20 log (|Ad| / |Ac|) |
| B. | -10 log (|Ac| / |Ad|)2 |
| C. | 20 log (v2 – v1 / 0.5(v2 + v1)) |
| D. | All of the mentioned |
| Answer» E. | |
| 7. |
If for an amplifier the common mode input signal is vc, the differential signal id vd and Ac and Ad represent common mode gain and differential gain respectively, then the output voltage v0 is given by |
| A. | v0 = Ad vd – Ac vc |
| B. | v0 = – Ad vd + Ac vc |
| C. | v0 = Ad vd + Ac vc |
| D. | v0 = – Ad vd – Ac vc |
| Answer» D. v0 = – Ad vd – Ac vc | |